There are no rules to kilt wearing, only guidelines. Each person is different, and should wear their kilt as they chose, just so long as they wear their kilts.

Regarding sporrans, I cannot afford a full dress sporran at this time. I wear my black leather "day" sporran when I need to be more formal, and my Bear Kilts clan sporran ( http://bearkilts.com/clancrests/clansporran.jpg) for casual days out. This works just fine for me. For the record Andrew bought a "fur" sporran in Scotland a few months back and he wears it to our kiltsnights. Bear in mind that this "fur" sporran cost a whopping 50 pounds and the thing is likely made out of a local feline. You trying telling a huge 6'7" coast guard in a kilt that he is in the wrong.